<Canvas
   xmlns="http://schemas.microsoft.com/client/2007"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   Width="225" Height="139">
   
   
    
     <Canvas.Triggers>
       <EventTrigger RoutedEvent="Canvas.Loaded">
         <BeginStoryboard>
           <Storyboard>
             <DoubleAnimation
               Storyboard.TargetName="translateTransform1"
               Storyboard.TargetProperty="Y"
               Duration="0:0:10"
               From="0" To="-134"  
               RepeatBehavior="Forever"  />   
             <DoubleAnimation
               Storyboard.TargetName="translateTransform2"
               Storyboard.TargetProperty="Y"
               Duration="0:0:10"
               From="0" To="-134"  
               RepeatBehavior="Forever"  />                  
           </Storyboard>
         </BeginStoryboard>
       </EventTrigger>
       
     </Canvas.Triggers> 
     
     
     <Canvas Width="225" Height="139">
       <Canvas.OpacityMask>
         <RadialGradientBrush>
           <GradientStop Offset="0.0" Color="Black" />
           <GradientStop Offset="1.0" Color="Transparent" />
         </RadialGradientBrush>
       </Canvas.OpacityMask>
       
       <Image 
         Canvas.Top="0"
         Source="images/sampletext.png">
         <Image.RenderTransform>
           <TranslateTransform x:Name="translateTransform1" />
         </Image.RenderTransform>
       </Image>
       <Image Canvas.Top="134"
         Source="images/sampletext.png">
         <Image.RenderTransform>
           <TranslateTransform x:Name="translateTransform2" />
         </Image.RenderTransform>
       </Image>       


     
     
     
     </Canvas>

     
      
   
   
   
     
   

   
    
</Canvas>
